Chain hoist



J. DOTZERT Feb. 9 1926.

CHAIN HOIST Filed Mamh 5, 1925 Patented Feb. 9, 1926.

UNITED STATES rarer oFFicE.

JACOB DOTZERT, OF DETROIT, MICHIGAN, ASSIGNOR TO WRIGHT MANUFACTUR- ING COMPANY, OF LISBON, OHIO.

CHAIN- HoIs'r.

Application filed. March 5, 1925. Serial No. 12,202.

To all whom-it may concern:

Be it known that I, JACOB Dorznn'r, a

citizen of the United States, residing at De-,

troit, in the county of Wayne and State of Michigan,.have invented anew and useful Improvement in Chain Hoists, of which the following is a specification.

This invention relates to chain hoists and more particularly to a guard for use in connection therewith whereby the lifting chain of the hoist is maintained at all times in proper engagement with its sheave so that it becomes impossible for the chain to accumulate slack which, when suddenly paid out under the weight of the load not only en-v dangers the life of the operator, but often causes breakage of the chain.

Another object of the invention is to pro-' vide a guard which. is simple, durable and efiicient, and can be applied readily to chain hoists already in use.

Vith the foregoing and other objects in in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings Figure 1 is a transverse section through a chain hoisthaving the present improvements combined therewith.

Fig. 2 is a vertical section through the hoist showing the chain sheave and its guard in elevation.

Fig. 3 is a perspective view of the guard. Fig. 4 is a section through a portion of the guard andthe adjacent portions of the spaced supporting elements, said section being taken on the line 44, Fig. 2.

Referring to the figures by characters of reference 1 designates the sheave of a chain hoist, this sheave being provided, in its periphery, with recesses 2 so shaped that the chain 3 will fit properly on the sheave without danger of slipping. The chain hoist can be of any preferred construction although it is preferably substantially of the type wherein motion is transmitted from a chain which the sheave 1 is mounted.

gear C which, in turn, drives gears D having smaller gears E meshing with an internal gear F. These gears D and E are carried by a disk G secured to a sleeve H on struction is well known and does not constitute any part of the present invention.

Hoists of this typeand which are used largely in machine shops, by factory millwrights, and wherever a portable hoist is de sired, have been objectionable because in the handling of the hoist, load chains have often become disarranged on their sheaves with the result that sometimes a load has been elevated to a certain point without properly paying outthe chain from the sheave. Consequently a slack. has been accumulated and if the chain should become dislodged on its sheave because of its faulty engagement therewith, the load has been dropped and often broken the chain or caused injury to the operator. As has already been explained it is an object of this invention to avoid this objectionable feature by providing a guard 'which will always hold the chain in proper engagement with its sheave. As shown particularly in Figs. 2 and 3, the guard comprises an arcuate strip 4: adapted to extend approximately one-half way around the sheave, this guard being of substantially the same width as the sheave. One end of the guard is outturned as at 5 and has a terminal sleeve 6 for the reception of an attaching pin 7 which engages stationary supporting elements 8 of the hoist. The other end of the guard forms an offset tongue 8 having a transverse sleeve 9 also adapted to be attached to the members 8 by a pin 10, there being a lug 11 extending from this sleeve and to which one end of the hoist chain can be detachably connected as shown in Fig. 2 and held thereon by a cotter pin 12 extending through an opening 13 in the lug. For the purpose of assisting in holding the guard properly assembled with the sheave, lugs 14 are extended laterally therefrom and project into sockets 15 formed in the members 8 as indicated particularly in Fig. 4.

That face of the guard nearest the sheave 1 is provided with a central longitudinal groove 16 adapted to receive the projecting portions of those links which are supported with their edges in engagement with the sheave.

operated wheel A through a shaft B to a It will be apparent that when a guard such as descrihed is: in place in the hoist, the chain 3 'annot get out (it proper position with respect to the sheave .1 but will always be prorerly fed thereby and held against the slipping-which would result should the chain work out of the grooves in thesheave.

The guard can he applied readily to a hoist such as described and will in no way interilicre with the proper actuation of the hoist.

\Vhat is claimed is:-

The combination withaheist including spaced members, a sheave mounted for 1:0- tation thcrehetween and having a series of periphery recesses, and a load chain supported by the sheave and having certain of JACOB DO'TZERT. 

